This one is a head scratcher. The bike sputters and dies, almost as if its out of fuel or in too low a gear (not the problem). but this only happens in gear, it idles fine and will rev normally in neutral. It's also an intermittent problem, has happened 3 times in the last 3 months. Twice just as I was leaving and once in the middle of a ride. Shutting it off seems to fix it. Thoughts?